Which of the Following Statements Concerning Occupational Mobility Is Accurate

Which of the following statements concerning occupational mobility is accurate?

A) Upward occupational mobility was much greater than downward occupational mobility.
B) Occupational mobility was rare in the United States in the years following the Civil War.
C) Native whites had a lower rate of upward mobility than immigrants.
D) Upward social mobility was more easily achieved by females than by males.